Privacy policy

Everything you type into our calculators is worked out in your own browser. We never send it to us or store it.

Advertising and cookies

Optional Google AdSense advertising is disabled until you accept advertising. When enabled, Google may receive your IP address, browser and device information, cookie identifiers and page visits for ad delivery, personalisation and measurement. Calculator inputs are not sent to Google by our calculators.

We store your advertising choice, the notice version, and the time of your choice in this browser. This necessary preference storage is separate from optional advertising cookies. You can reject optional advertising as easily as accepting it, and reopen Cookie settings in the footer at any time. Withdrawal stops future advertising on this site; it does not automatically delete cookies already set by Google. You can remove those through your browser settings.

Advertising remains disabled when your country cannot be determined, and for visitors in the EEA, United Kingdom and Switzerland until a Google-certified consent platform is configured. This site's privacy-choice banner is not a Google-certified consent platform.

Read how Google uses information from partner sites and manage personalisation in Google My Ad Center.

POPIA

South Africa's Protection of Personal Information Act provides rights concerning your personal information. Calculator values stay in your browser, and optional advertising follows the choice described above. For a privacy question, use the contact link on the Advertise page.